RAID-6 offers additional redundancy in allowing for two simultaneous drive failures. It is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme (two-dimensional parity). RAID 10 (or 1+0) uses both striping and mirroring. Either way RAID data recovery is always an option.

Drive failures frequently are correlated and if you absolutely don’t want to lose your data, RAID 6 is the safer of the two options. There’s always the possibility that a second drive will fail during the build of the hot spare process.